Hey nivshah 
If I’d have to hazard a guess, the reason you can limit votes is so that your members use them wisely and don’t vote for everything else it kind of devalues a vote.
At the moment one way users can get their vote back is by closing the topic. Let’s say you decided to implement a voted feature into a game for example, you can close the topic and this will refund users that vote if you will and they will be able to use it on another topic.